package com.biscuit.page.basicservice.utils;

import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;

/**
 * @author biscuit
 * @createTime 2024/5/18 10:56
 */
public class IpUtil {

    public static String getIpAddress(HttpServletRequest request) {

        String Xip = request.getHeader("X-Real-IP");

        String XFor = request.getHeader("X-Forwarded-For");

        // 多次反向代理后会有多个ip值，第一个ip才是真实ip
        if(StringUtils.isNotEmpty(XFor) && !"unKnown".equalsIgnoreCase(XFor)){

            int index = XFor.indexOf(",");

            if(index != -1){

                return XFor.substring(0,index);
            }else {

                return XFor;
            }
        }

        XFor = Xip;

        if(StringUtils.isNotEmpty(XFor) && !"unKnown".equalsIgnoreCase(XFor))
            return XFor;

        if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor))
            XFor = request.getHeader("Proxy-Client-IP");

        if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor))
            XFor = request.getHeader("WL-Proxy-Client-IP");

        if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor))
            XFor = request.getHeader("HTTP_CLIENT_IP");

        if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor))
            XFor = request.getHeader("HTTP_X_FORWARDED_FOR");

        if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor))
            XFor = request.getRemoteAddr();

        return "0:0:0:0:0:0:0:1".equals(XFor) ? "127.0.0.1" : XFor;
    }

}
